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From: "steffen at sdaoden dot eu" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29913] New: iconv(3) is not POSIX compliant, and does not
 conform to linux man-pages manual
Date: Fri, 16 Dec 2022 23:03:28 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.36
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: steffen at sdaoden dot eu
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29913

            Bug ID: 29913
           Summary: iconv(3) is not POSIX compliant, and does not conform
                    to linux man-pages manual
           Product: glibc
           Version: 2.36
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: steffen at sdaoden dot eu
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Disclaimer: i have reported this in the past but the issue was closed.

The problem is that without //TRANSLIT GNU iconv(3) fails to perform the

  If iconv( ) encounters a character in the input buffer that is valid, but=
 for
which an identical character does not exist in the target codeset, iconv( )
shall perform an implementation-defined conversion on this character.

POSIX iconv(3) (Vol. 2: System Interfaces, Issue 7) requirement.
Instead GNU libc returns EILSEQ which is wrong as POSIX defined EILSEQ only=
 for

  [EILSEQ] Input conversion stopped due to an input byte that does not belo=
ng
to the input codeset.

The Linux man-pages 6.01 manual (2022=E2=80=9010=E2=80=9009) says the same.=
  But GNU libc
_does_ fail for EILSEQ without //TRANSLIT even if the input is valid UTF-8.
As can be seen by running this (shortened variant of a config test program).
I say "Bye!" already here, and hope it gets fixed!

#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <iconv.h>
int main(void){
        char inb[16], oub[16], *inbp, *oubp;
        iconv_t id;
        size_t inl, oul;
        int rv;

        memcpy(inbp =3D inb, "\341\203\276", sizeof("\341\203\276"));
        inl =3D sizeof("\341\203\276") -1;
        oul =3D sizeof oub;
        oubp =3D oub;

        rv =3D 1;
        if((id =3D iconv_open("us-ascii"/*//TRANSLIT"*/, "utf-8")) =3D=3D
(iconv_t)-1)
                goto jleave;

        rv =3D 14;
        if(iconv(id, &inbp, &inl, &oubp, &oul) =3D=3D (size_t)-1)
{
fprintf(stderr, "error %s %d=3D=3D%d\n",strerror(errno),errno,errno=3D=3DEI=
LSEQ);
                goto jleave;
}

fprintf(stderr, "bummer\n");
jleave:
        if(id !=3D (iconv_t)-1)
                iconv_close(id);

        return rv;
}

--=20
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